director general david petraeus is out tonight. just three days after president obama won re-election. petraeus says the reason isen extramarital affair. this is one of those stories that virtually no one saw coming. we begin with ed henry. >> reporter: officials were stunned when general petraeus came to the president and told him that he wanted to step down. he has had a long distinguished military record of decades, architect of the surge in iraq. you will remember. in 2007 under president bush. came back and became the commander on the ground in afghanistan against president obama. the general has come under fire for the c.i.a. role in benghazi terror attack, people close to him tonight insist the resignation had nothing to do with the ips dept. this is a personal failing that he talked about today in a statement saying after being married for over 37 years i showed extremely poor judgment by engaging in an extramarital affair. such behavior is unacceptable as a husband and leader of an organization such as ours. this afternoon